Mtjltiple-cutseb-bisk



Jan. 31, 1928.

l. c. BELL MULTIPLE CUTTER DISK BIT Filed Jan. 5, 1925 2 Sheets-Sheet lJan. 31, 1928.

I. C. BELL MULTIPLE CUTTER DISK BIT Filed Jan. 5, 1925 2 Sheets-Sheet 2IVAN o. BELL,

Patented Jan. 31, 1928.

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V DALLAS, TEXAS, A. CORPORATION OF DELAWARE.

MULTIPLE-CUTTER-DISK BIT.

Application filed January 5, 1925. Serial No. 540.

This invention relates to new and useful improvements in multiple cutterdisk bits.

The object of the invention is to produce a tour-way cutter bit of thetype set forth in my copending a} )plications Serial No. 716,970 andSerial No. T l-ELMJ".

An advantage of such an improvement is that smaller-disks and a greaternumber can be used, whereby increased. cutting and longor life results.

Another tleature oi the improvement is that less vibration being hadcrystallization is reduced to a minimum and sn'ioother run ning withless power is obtained.

Further a bit off this type is sellcentering in all formations,possesses greater strength and requires less skill on the part of thedriller.

A construction designed to carry out the invention will be hereinait'crdescribed together with other features of the invention.

The invention will be more readily understood from a reading of thefollowing speciiication and by reference to the acco1npanying drawings,in which an example of the invention is shown, and wherein:

Fig. 1 is an elevation of a bit constructed in accordance with inyinvention, i

Fig. 2 is an underside view of the same, Fig. 3 is a cross-sectionalview on the line 3-3 of Fig. 1,

Fig. 4 is a. cross sectional view onthe line 1-4l of Fig. 1, i i

Fig. 5 is a vertical sectional view of the bit,

Fig. 6 is an enlarged sectional viewon the line 6-6 of Fig. 1, and

Fig. 7 is a plan view. In the drawings the numeral 10 designates a bitbody or stock having a reduced. tapored. pin 11 or any other drill st'emconnection at its upper end. The pin is Slll.'l.'01l]l(led by anoutwardly directed shoulder 153. The upper portion of the stock iscylindri cal, although this is merely a preferred de-- sign. The stockis termed with a depending axial stud The stock has tour equally spacedchannels 14: in its outer surface provided in their bottoms withdovetailed vertical key ways 15.

{Standards 16 are formed to fit in the channels and have keys 1'?engaging in the key ways 15. These standards have their upper endsshouldered and cut back flush with the surface of thestock, butthroughout the greater portion of their length, extend radially from thestock. The upper ends of the standards abut the upper ends of thechannels and key ways, which thus take the upward thrust. The standardsare fastened by screws 18. It is to be understood that the manner ofseating and fastening the standards in the stock may be carried out invarious manners.

Each standard has its lower end extending below the stock and isprovided with recesses 19 and 20 with aweb therebetween andan outer web22 flush with the outer surface of the standard. The stud 13 is foursided and has its sides parallel to the webs 21. The sides of the studare cut back from keyways 15 (Fig. 5) so that a shoulder 23 overhangseach side of the stud, whereby the webs 21 are spaced from the sides ofthe stud.

An axle 24 is provided for each standard and each axle comprises ascrewthreaded head 25 engaged in the outer web 22 and a reduced shoulderedend 26 engaging in a socket 27 in the stud. Each axle passes through theweb 21. On each axle is niounted a cutting disk 28 in the recess 19.This disk is thickest at its hub portion, being reduced or inclined oneside toward its outer edge which is bevelled in the opposite direction,so as to flare from the web 21.

The width of the recess 19 is considerably greater than the thickness ofthe disk. This permits the disk to play radially of the bit on the axle.The disk has a central aperture 29 larger in diameter than the axle,whereby the disk may move radially of the axle and niay deflect or tiltfrom its normal vertical plane while rotating, thus wobbling on itsaxle.

As before stated the bores oil. the disks are made larger than thediameters of the axles, so that instead. of having merely a turning titand the play usually present, the clearance. or play between the journalof each disk and its axle sluch to initially give the disk a very loosefit and a lateral or vertical. inovementor both, relative to the axle.This re sults in an amplified, wobble, oscillation or shifting of thedisk which is most prominent at its periphery and also causes the diskto rotate freely. The disk thus becomes selfsharpening and thissharpening is enhanced by the shearing action of the edge of the disk,due to wobble, oscillation or shift. The plified movement not only makesfor sharp but causes faster cutting due to the shearing Y action.

' disks.

' further explanation, it may be stated after nunierous by actualdrilling. that the disks traversing circuitous or sinuous paths ratherthan singular circular paths and being under the downward pressure ofthe superimposed drill stem, notonly cover a greater transverse area intheir travel by pcripheralcontact with the bottom of the hole, but haveavery eiiective self-sharpening ac t ion,'due to the wobble, the lead oroffset of the disks from the transverse axis oi the bit body and theweightplaced upon the It. is obvious that such disks will tend to chipotl' therock and shale and will out faster by kee 'i'ing a sharp edge.

By maintaining; a sharp cutting edge. by traversing a greater path andby moving transversely of its cutting are, the disks cut faster. Theadvantage of a continuous drilling bit which goes thri'iugrh hard aswell as soft'tormations whereas it has been neces sary heretofore tocome out oi? the hole and chan e bits is of reater advantage as will beappreciated by the driller. The oll'setting of the axles with. relationto the trai'isverse axis of the b1l3'1S very nnportant as this gives thedisks a drag and adds to their cutting action. The central disks arealso very effective in cutting out the core. V Between'the web 21 ofeach standard and the stud 18, disks 30 and 31, respectively, aremounted on each axle. a central aperture 30: and is otherwise thesame/as the disk 28, except that it is smaller in diameter. Each disk 31is made flat on both sides and of constant thickness, but this issubject to variation. The stud has around boss 82 surrounding eachsocket 27 which acts to keep the disks 31 from rubbing the sides of thestuds.

The thickened hub and inclined side of the disk 30 spaces the surfacesapart. The.

disk 31 has an enlarged central aperture 31.

The disks 30 and 31 have ample play along the axle between the web andstud.

itt'hey were separated by a support therev and removing the axles 24.

between. I

A well 33 is bored axially in the pin 11 and stock 10; ater ducts 34 arecminter-bored from the bottom of the well through the stock (Fig. 5) andstandards 16 so as to discharge into the recesses l9 and 20 over thedisks. It will be seen that the disks are copiously supplied with wateror slush and are adequately washed. \Vhen the disks, axles or standardswear out they may be readily replaced by removing the screws 18 .TFl-ife disks" successively increasing in (ii.-

The disk 30 has ameter outwardly of the bit will cause a centering thebit and making a straight hole.

Various changes in the size and shape of the ditlerent parts, aswell asmodifications and alterations may be made within the scope of theappended claims.

lVhat I claim. is:

1. In a multiple cutter disk bit, a bit body. axles mounted atsubstantially right angles to each other and having their inner endssupported by the body at the lower end thereof, cutter disks looselymounted on said axles and movable laterally thereon. and removablesupports for the outer ends of all the axles attached to the body.

2. In a multiple cutter disk bit, a bit body. axles mounted at angles toeach other and having their inner ends supported by llll body, cutterdisks loosely mounted on said axles and movable laterally and radiallyin a vertical plane. and renmvable supports for the outer ends of tl'ieaxlcs attached to the body.

3. In a multiple cutterdisk bit. a bit body. a plurality oi cutter disksmounted at right angles to each other andbeing loose upon their journalsso as to wobble when the bit isrotated, and removable standards seatedin the body for confining said disks and for taking the wear as the bitis rotated.

4. In a multiple cutter disk bit, a bit body, a plurality of cutterdisks mounted at an glee to each other and being loose upon theirjournals so as to WOblJldWllQll the bit is rotated, and removablestandards seated in the body for confining said disks and for taking;

the wear as thebit is rotated, said stand ards projecting outwardly fromthe bit body.

5. In a multiple cutter disk bit, a bit body, removable wear members onthe sides of the body at an angle to each other, transverse axlescarried by the body and the members, and a plurality of cutter disksmounted to move longitudinally as well as vertically of said axlesbetween said wear members and the body.

6. In a multiple cutter disk bit, a stock having a drill connection atits upper end, a stud depending from the bottom ol the stock, standardsmounted at an angle to each other on the stock, axles carried by thestud and standards, and wobbling disks mounted on the axles.

7. In a multiple cutter disk bit, a stock having a drill oonnectionatits upper end, a stud depending from the bottom of the stock, standardsmounted at an angle to each other on the stock, axles carried by thestud and standards, webs supporting the axles between the stud andstandards, and disks having each a hub thickness less than the spacesbetween the axle supports, whereby said disks are treeto movelongitudinally Eli) tii)

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of the axles, said disks being loose upon their axles so as to wobble.

8. In a multiple cutter disk bit, a stock having a drill connection atits upper end, a stud depending frointhe bottom of the stock, standardsmounted at an angle to each other onthe stock, axles carried by the studand standards, Webs supporting the axles between the stud and standards,disks having each a hub thickness less than the spaces between the axlesupports, whereby said disks are tree to move longitudinally of theaxles, said disks being loose upon their axles so as to wobble, andducts in the stock for supplying liquid to each disk,

5). in a multiple cutter disk bit, a stock having seats atsulistantiaily right angles to each other, a stud. depending from thecentor of the stock, standards engaging in said seats and projectingoutwardly from the stock, axles having their inner ends supported in thestud and their outer ends en gaged in the standards, means for holdingthe standards in the stock, and a plurality of disks loosely mounted oneach axle so as to Wobble when the bit is rotated.

the standards in the stock, each standard having a Web at its lower endsupporting axles, the standards having recesses at the webs, and aplurality of cutter disks loosely mounted on each axle so as to Wobble,some of the disks being separated by the web.

111.. In a multiple cutter disk bit, a. bit body having); a centraldepending;- stud, a plurality ct axles disposed at an angle to eachother and in siibstantially the san'iehorizoutai plane with their innerends support ed by said stud, cutter disks loosely 1nonnted. on saidaxles and movable While revolv ing out oi": their normal plane, andsupports carried by the body for the outer ends of the axles.

In testimony whereof I afiix my signature.

IVAN C. BELL.

